All Security Checks
HeadersHigh PriorityPro
Access-Control-Allow-Credentials
This CORS header determines whether browsers should expose responses to frontend JavaScript when credentials are included.
Why It Matters
Misconfigured credentials handling can allow malicious sites to make authenticated requests to your API and read the responses, stealing user data.
How We Check
We verify that Access-Control-Allow-Credentials is only used with specific origins (not wildcards) and proper Access-Control-Allow-Origin values.
How to Fix
Only set Access-Control-Allow-Credentials: true with explicit origin validation. Never use with Access-Control-Allow-Origin: *.
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